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✏️ Editing: git.py Read Only

import logging
import os.path
import pathlib
import re
import urllib.parse
import urllib.request
from typing import List, Optional, Tuple

from pip._internal.exceptions import BadCommand, InstallationError
from pip._internal.utils.misc import HiddenText, display_path, hide_url
from pip._internal.utils.subprocess import make_command
from pip._internal.vcs.versioncontrol import (
    AuthInfo,
    RemoteNotFoundError,
    RemoteNotValidError,
    RevOptions,
    VersionControl,
    find_path_to_project_root_from_repo_root,
    vcs,
)

urlsplit = urllib.parse.urlsplit
urlunsplit = urllib.parse.urlunsplit

logger = logging.getLogger(__name__)

GIT_VERSION_REGEX = re.compile(
    r"^git version "  # Prefix.
    r"(\d+)"  # Major.
    r"\.(\d+)"  # Dot, minor.
    r"(?:\.(\d+))?"  # Optional dot, patch.
    r".*$"  # Suffix, including any pre- and post-release segments we don't care about.
)

HASH_REGEX = re.compile("^[a-fA-F0-9]{40}$")

# SCP (Secure copy protocol) shorthand. e.g. 'git@example.com:foo/bar.git'
SCP_REGEX = re.compile(
    r"""^
    # Optional user, e.g. 'git@'
    (\w+@)?
    # Server, e.g. 'github.com'.
    ([^/:]+):
    # The server-side path. e.g. 'user/project.git'. Must start with an
    # alphanumeric character so as not to be confusable with a Windows paths
    # like 'C:/foo/bar' or 'C:\foo\bar'.
    (\w[^:]*)
    $""",
    re.VERBOSE,
)

def looks_like_hash(sha: str) -> bool:
    return bool(HASH_REGEX.match(sha))

class Git(VersionControl):
    name = "git"
    dirname = ".git"
    repo_name = "clone"
    schemes = (
        "git+http",
        "git+https",
        "git+ssh",
        "git+git",
        "git+file",
    )
    # Prevent the user's environment variables from interfering with pip:
    # https://github.com/pypa/pip/issues/1130
    unset_environ = ("GIT_DIR", "GIT_WORK_TREE")
    default_arg_rev = "HEAD"

@staticmethod
    def get_base_rev_args(rev: str) -> List[str]:
        return [rev]

def is_immutable_rev_checkout(self, url: str, dest: str) -> bool:
        _, rev_options = self.get_url_rev_options(hide_url(url))
        if not rev_options.rev:
            return False
        if not self.is_commit_id_equal(dest, rev_options.rev):
            # the current commit is different from rev,
            # which means rev was something else than a commit hash
            return False
        # return False in the rare case rev is both a commit hash
        # and a tag or a branch; we don't want to cache in that case
        # because that branch/tag could point to something else in the future
        is_tag_or_branch = bool(self.get_revision_sha(dest, rev_options.rev)[0])
        return not is_tag_or_branch

def get_git_version(self) -> Tuple[int, ...]:
        version = self.run_command(
            ["version"],
            command_desc="git version",
            show_stdout=False,
            stdout_only=True,
        )
        match = GIT_VERSION_REGEX.match(version)
        if not match:
            logger.warning("Can't parse git version: %s", version)
            return ()
        return (int(match.group(1)), int(match.group(2)))

@classmethod
    def get_current_branch(cls, location: str) -> Optional[str]:
        """
        Return the current branch, or None if HEAD isn't at a branch
        (e.g. detached HEAD).
        """
        # git-symbolic-ref exits with empty stdout if "HEAD" is a detached
        # HEAD rather than a symbolic ref.  In addition, the -q causes the
        # command to exit with status code 1 instead of 128 in this case
        # and to suppress the message to stderr.
        args = ["symbolic-ref", "-q", "HEAD"]
        output = cls.run_command(
            args,
            extra_ok_returncodes=(1,),
            show_stdout=False,
            stdout_only=True,
            cwd=location,
        )
        ref = output.strip()

if ref.startswith("refs/heads/"):
            return ref[len("refs/heads/") :]

return None

@classmethod
    def get_revision_sha(cls, dest: str, rev: str) -> Tuple[Optional[str], bool]:
        """
        Return (sha_or_none, is_branch), where sha_or_none is a commit hash
        if the revision names a remote branch or tag, otherwise None.

Args:
          dest: the repository directory.
          rev: the revision name.
        """
        # Pass rev to pre-filter the list.
        output = cls.run_command(
            ["show-ref", rev],
            cwd=dest,
            show_stdout=False,
            stdout_only=True,
            on_returncode="ignore",
        )
        refs = {}
        # NOTE: We do not use splitlines here since that would split on other
        #       unicode separators, which can be maliciously used to install a
        #       different revision.
        for line in output.strip().split("\n"):
            line = line.rstrip("\r")
            if not line:
                continue
            try:
                ref_sha, ref_name = line.split(" ", maxsplit=2)
            except ValueError:
                # Include the offending line to simplify troubleshooting if
                # this error ever occurs.
                raise ValueError(f"unexpected show-ref line: {line!r}")

refs[ref_name] = ref_sha

branch_ref = f"refs/remotes/origin/{rev}"
        tag_ref = f"refs/tags/{rev}"

sha = refs.get(branch_ref)
        if sha is not None:
            return (sha, True)

sha = refs.get(tag_ref)

return (sha, False)

@classmethod
    def _should_fetch(cls, dest: str, rev: str) -> bool:
        """
        Return true if rev is a ref or is a commit that we don't have locally.

Branches and tags are not considered in this method because they are
        assumed to be always available locally (which is a normal outcome of
        ``git clone`` and ``git fetch --tags``).
        """
        if rev.startswith("refs/"):
            # Always fetch remote refs.
            return True

if not looks_like_hash(rev):
            # Git fetch would fail with abbreviated commits.
            return False

if cls.has_commit(dest, rev):
            # Don't fetch if we have the commit locally.
            return False

return True

@classmethod
    def resolve_revision(
        cls, dest: str, url: HiddenText, rev_options: RevOptions
    ) -> RevOptions:
        """
        Resolve a revision to a new RevOptions object with the SHA1 of the
        branch, tag, or ref if found.

Args:
          rev_options: a RevOptions object.
        """
        rev = rev_options.arg_rev
        # The arg_rev property's implementation for Git ensures that the
        # rev return value is always non-None.
        assert rev is not None

sha, is_branch = cls.get_revision_sha(dest, rev)

if sha is not None:
            rev_options = rev_options.make_new(sha)
            rev_options.branch_name = rev if is_branch else None

return rev_options

# Do not show a warning for the common case of something that has
        # the form of a Git commit hash.
        if not looks_like_hash(rev):
            logger.warning(
                "Did not find branch or tag '%s', assuming revision or ref.",
                rev,
            )

if not cls._should_fetch(dest, rev):
            return rev_options

# fetch the requested revision
        cls.run_command(
            make_command("fetch", "-q", url, rev_options.to_args()),
            cwd=dest,
        )
        # Change the revision to the SHA of the ref we fetched
        sha = cls.get_revision(dest, rev="FETCH_HEAD")
        rev_options = rev_options.make_new(sha)

return rev_options

@classmethod
    def is_commit_id_equal(cls, dest: str, name: Optional[str]) -> bool:
        """
        Return whether the current commit hash equals the given name.

Args:
          dest: the repository directory.
          name: a string name.
        """
        if not name:
            # Then avoid an unnecessary subprocess call.
            return False

return cls.get_revision(dest) == name

def fetch_new(
        self, dest: str, url: HiddenText, rev_options: RevOptions, verbosity: int
    ) -> None:
        rev_display = rev_options.to_display()
        logger.info("Cloning %s%s to %s", url, rev_display, display_path(dest))
        if verbosity <= 0:
            flags: Tuple[str, ...] = ("--quiet",)
        elif verbosity == 1:
            flags = ()
        else:
            flags = ("--verbose", "--progress")
        if self.get_git_version() >= (2, 17):
            # Git added support for partial clone in 2.17
            # https://git-scm.com/docs/partial-clone
            # Speeds up cloning by functioning without a complete copy of repository
            self.run_command(
                make_command(
                    "clone",
                    "--filter=blob:none",
                    *flags,
                    url,
                    dest,
                )
            )
        else:
            self.run_command(make_command("clone", *flags, url, dest))

if rev_options.rev:
            # Then a specific revision was requested.
            rev_options = self.resolve_revision(dest, url, rev_options)
            branch_name = getattr(rev_options, "branch_name", None)
            logger.debug("Rev options %s, branch_name %s", rev_options, branch_name)
            if branch_name is None:
                # Only do a checkout if the current commit id doesn't match
                # the requested revision.
                if not self.is_commit_id_equal(dest, rev_options.rev):
                    cmd_args = make_command(
                        "checkout",
                        "-q",
                        rev_options.to_args(),
                    )
                    self.run_command(cmd_args, cwd=dest)
            elif self.get_current_branch(dest) != branch_name:
                # Then a specific branch was requested, and that branch
                # is not yet checked out.
                track_branch = f"origin/{branch_name}"
                cmd_args = [
                    "checkout",
                    "-b",
                    branch_name,
                    "--track",
                    track_branch,
                ]
                self.run_command(cmd_args, cwd=dest)
        else:
            sha = self.get_revision(dest)
            rev_options = rev_options.make_new(sha)

logger.info("Resolved %s to commit %s", url, rev_options.rev)

#: repo may contain submodules
        self.update_submodules(dest)

def switch(self, dest: str, url: HiddenText, rev_options: RevOptions) -> None:
        self.run_command(
            make_command("config", "remote.origin.url", url),
            cwd=dest,
        )
        cmd_args = make_command("checkout", "-q", rev_options.to_args())
        self.run_command(cmd_args, cwd=dest)

self.update_submodules(dest)

def update(self, dest: str, url: HiddenText, rev_options: RevOptions) -> None:
        # First fetch changes from the default remote
        if self.get_git_version() >= (1, 9):
            # fetch tags in addition to everything else
            self.run_command(["fetch", "-q", "--tags"], cwd=dest)
        else:
            self.run_command(["fetch", "-q"], cwd=dest)
        # Then reset to wanted revision (maybe even origin/master)
        rev_options = self.resolve_revision(dest, url, rev_options)
        cmd_args = make_command("reset", "--hard", "-q", rev_options.to_args())
        self.run_command(cmd_args, cwd=dest)
        #: update submodules
        self.update_submodules(dest)

@classmethod
    def get_remote_url(cls, location: str) -> str:
        """
        Return URL of the first remote encountered.

Raises RemoteNotFoundError if the repository does not have a remote
        url configured.
        """
        # We need to pass 1 for extra_ok_returncodes since the command
        # exits with return code 1 if there are no matching lines.
        stdout = cls.run_command(
            ["config", "--get-regexp", r"remote\..*\.url"],
            extra_ok_returncodes=(1,),
            show_stdout=False,
            stdout_only=True,
            cwd=location,
        )
        remotes = stdout.splitlines()
        try:
            found_remote = remotes[0]
        except IndexError:
            raise RemoteNotFoundError

for remote in remotes:
            if remote.startswith("remote.origin.url "):
                found_remote = remote
                break
        url = found_remote.split(" ")[1]
        return cls._git_remote_to_pip_url(url.strip())

@staticmethod
    def _git_remote_to_pip_url(url: str) -> str:
        """
        Convert a remote url from what git uses to what pip accepts.

There are 3 legal forms **url** may take:

1. A fully qualified url: ssh://git@example.com/foo/bar.git
            2. A local project.git folder: /path/to/bare/repository.git
            3. SCP shorthand for form 1: git@example.com:foo/bar.git

Form 1 is output as-is. Form 2 must be converted to URI and form 3 must
        be converted to form 1.

See the corresponding test test_git_remote_url_to_pip() for examples of
        sample inputs/outputs.
        """
        if re.match(r"\w+://", url):
            # This is already valid. Pass it though as-is.
            return url
        if os.path.exists(url):
            # A local bare remote (git clone --mirror).
            # Needs a file:// prefix.
            return pathlib.PurePath(url).as_uri()
        scp_match = SCP_REGEX.match(url)
        if scp_match:
            # Add an ssh:// prefix and replace the ':' with a '/'.
            return scp_match.expand(r"ssh://\1\2/\3")
        # Otherwise, bail out.
        raise RemoteNotValidError(url)

@classmethod
    def has_commit(cls, location: str, rev: str) -> bool:
        """
        Check if rev is a commit that is available in the local repository.
        """
        try:
            cls.run_command(
                ["rev-parse", "-q", "--verify", "sha^" + rev],
                cwd=location,
                log_failed_cmd=False,
            )
        except InstallationError:
            return False
        else:
            return True

@classmethod
    def get_revision(cls, location: str, rev: Optional[str] = None) -> str:
        if rev is None:
            rev = "HEAD"
        current_rev = cls.run_command(
            ["rev-parse", rev],
            show_stdout=False,
            stdout_only=True,
            cwd=location,
        )
        return current_rev.strip()

@classmethod
    def get_subdirectory(cls, location: str) -> Optional[str]:
        """
        Return the path to Python project root, relative to the repo root.
        Return None if the project root is in the repo root.
        """
        # find the repo root
        git_dir = cls.run_command(
            ["rev-parse", "--git-dir"],
            show_stdout=False,
            stdout_only=True,
            cwd=location,
        ).strip()
        if not os.path.isabs(git_dir):
            git_dir = os.path.join(location, git_dir)
        repo_root = os.path.abspath(os.path.join(git_dir, ".."))
        return find_path_to_project_root_from_repo_root(location, repo_root)

@classmethod
    def get_url_rev_and_auth(cls, url: str) -> Tuple[str, Optional[str], AuthInfo]:
        """
        Prefixes stub URLs like 'user@hostname:user/repo.git' with 'ssh://'.
        That's required because although they use SSH they sometimes don't
        work with a ssh:// scheme (e.g. GitHub). But we need a scheme for
        parsing. Hence we remove it again afterwards and return it as a stub.
        """
        # Works around an apparent Git bug
        # (see https://article.gmane.org/gmane.comp.version-control.git/146500)
        scheme, netloc, path, query, fragment = urlsplit(url)
        if scheme.endswith("file"):
            initial_slashes = path[: -len(path.lstrip("/"))]
            newpath = initial_slashes + urllib.request.url2pathname(path).replace(
                "\\", "/"
            ).lstrip("/")
            after_plus = scheme.find("+") + 1
            url = scheme[:after_plus] + urlunsplit(
                (scheme[after_plus:], netloc, newpath, query, fragment),
            )

if "://" not in url:
            assert "file:" not in url
            url = url.replace("git+", "git+ssh://")
            url, rev, user_pass = super().get_url_rev_and_auth(url)
            url = url.replace("ssh://", "")
        else:
            url, rev, user_pass = super().get_url_rev_and_auth(url)

return url, rev, user_pass

@classmethod
    def update_submodules(cls, location: str) -> None:
        if not os.path.exists(os.path.join(location, ".gitmodules")):
            return
        cls.run_command(
            ["submodule", "update", "--init", "--recursive", "-q"],
            cwd=location,
        )

@classmethod
    def get_repository_root(cls, location: str) -> Optional[str]:
        loc = super().get_repository_root(location)
        if loc:
            return loc
        try:
            r = cls.run_command(
                ["rev-parse", "--show-toplevel"],
                cwd=location,
                show_stdout=False,
                stdout_only=True,
                on_returncode="raise",
                log_failed_cmd=False,
            )
        except BadCommand:
            logger.debug(
                "could not determine if %s is under git control "
                "because git is not available",
                location,
            )
            return None
        except InstallationError:
            return None
        return os.path.normpath(r.rstrip("\r\n"))

@staticmethod
    def should_add_vcs_url_prefix(repo_url: str) -> bool:
        """In either https or ssh form, requirements must be prefixed with git+."""
        return True

vcs.register(Git)

✏️ Editing: git.py Read Only

import logging
import os.path
import pathlib
import re
import urllib.parse
import urllib.request
from typing import List, Optional, Tuple

urlsplit = urllib.parse.urlsplit
urlunsplit = urllib.parse.urlunsplit

logger = logging.getLogger(__name__)

HASH_REGEX = re.compile("^[a-fA-F0-9]{40}$")

def looks_like_hash(sha: str) -> bool:
    return bool(HASH_REGEX.match(sha))

@staticmethod
    def get_base_rev_args(rev: str) -> List[str]:
        return [rev]

if ref.startswith("refs/heads/"):
            return ref[len("refs/heads/") :]

return None

refs[ref_name] = ref_sha

branch_ref = f"refs/remotes/origin/{rev}"
        tag_ref = f"refs/tags/{rev}"

sha = refs.get(branch_ref)
        if sha is not None:
            return (sha, True)

sha = refs.get(tag_ref)

return (sha, False)

@classmethod
    def _should_fetch(cls, dest: str, rev: str) -> bool:
        """
        Return true if rev is a ref or is a commit that we don't have locally.

if not looks_like_hash(rev):
            # Git fetch would fail with abbreviated commits.
            return False

if cls.has_commit(dest, rev):
            # Don't fetch if we have the commit locally.
            return False

return True

sha, is_branch = cls.get_revision_sha(dest, rev)

if sha is not None:
            rev_options = rev_options.make_new(sha)
            rev_options.branch_name = rev if is_branch else None

return rev_options

if not cls._should_fetch(dest, rev):
            return rev_options

return rev_options

@classmethod
    def is_commit_id_equal(cls, dest: str, name: Optional[str]) -> bool:
        """
        Return whether the current commit hash equals the given name.

Args:
          dest: the repository directory.
          name: a string name.
        """
        if not name:
            # Then avoid an unnecessary subprocess call.
            return False

return cls.get_revision(dest) == name

logger.info("Resolved %s to commit %s", url, rev_options.rev)

#: repo may contain submodules
        self.update_submodules(dest)

self.update_submodules(dest)

@classmethod
    def get_remote_url(cls, location: str) -> str:
        """
        Return URL of the first remote encountered.

@staticmethod
    def _git_remote_to_pip_url(url: str) -> str:
        """
        Convert a remote url from what git uses to what pip accepts.

There are 3 legal forms **url** may take:

Form 1 is output as-is. Form 2 must be converted to URI and form 3 must
        be converted to form 1.

return url, rev, user_pass

@staticmethod
    def should_add_vcs_url_prefix(repo_url: str) -> bool:
        """In either https or ssh form, requirements must be prefixed with git+."""
        return True

vcs.register(Git)

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